I couldn't find anthing smaller than 10 mil laying about the office but
considering these old eyes it did a fine job on that .

> -----Original Message-----
> From: Steve Kelly [SMTP:[log in to unmask]]
> Sent: Tuesday, September 05, 2000 12:20 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Non-destructive Thru-hole Inspection
>
> How small a hole can you view. Thanks Steve Kelly
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin D Asbell
> Sent: Tuesday, September 05, 2000 1:26 PM
> To: [log in to unmask]
> Subject: Re: [TN] Non-destructive Thru-hole Inspection
>
>
> Dave,
>
> A device we use that is quick and easy is a PCB through hole eyepiece
> (kind
> of ironic, yes...~grin~) Sometimes called a prism eyepiece. Any supplier
> of
> optical devices for
> electronics should be able to direct you to a source. This device uses a
> prism lens that splits the through hole into 9 images each a an oblique
> angle for viewing the holl
> wall. It's a real quick way to confirm hole wall quality.
>
> Franklin D Asbell
> Network Circuits, Inc.
> Irving, Texas 75061
>
>
> Dave Kell wrote:
>
> > We are looking for a way to look inside plated through holes to check
> the
> electroless plated deposit for voids prior to electrolytic. Possibly a
> fiber
> optic video scope?
> >
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